diff --git a/Android/doric/src/main/java/pub/doric/Doric.java b/Android/doric/src/main/java/pub/doric/Doric.java
index e128c0b0..c85dbe5d 100644
--- a/Android/doric/src/main/java/pub/doric/Doric.java
+++ b/Android/doric/src/main/java/pub/doric/Doric.java
@@ -17,8 +17,6 @@ package pub.doric;
 
 import android.app.Application;
 
-import pub.doric.dev.ConnectCallback;
-
 /**
  * @Description: Doric
  * @Author: pengfei.zhou
@@ -35,8 +33,8 @@ public class Doric {
         return sApplication;
     }
 
-    public static void connectDevKit(String url, ConnectCallback connectCallback) {
-        DoricDriver.getInstance().connectDevKit(url, connectCallback);
+    public static void connectDevKit(String url) {
+        DoricDriver.getInstance().connectDevKit(url);
     }
 
     public static void disconnectDevKit() {
diff --git a/Android/doric/src/main/java/pub/doric/DoricDriver.java b/Android/doric/src/main/java/pub/doric/DoricDriver.java
index 900e01e1..e36d67df 100644
--- a/Android/doric/src/main/java/pub/doric/DoricDriver.java
+++ b/Android/doric/src/main/java/pub/doric/DoricDriver.java
@@ -20,7 +20,6 @@ import android.os.Looper;
 
 import pub.doric.async.AsyncCall;
 import pub.doric.async.AsyncResult;
-import pub.doric.dev.ConnectCallback;
 import pub.doric.dev.WSClient;
 import pub.doric.engine.DoricJSEngine;
 import pub.doric.utils.DoricConstant;
@@ -139,8 +138,8 @@ public class DoricDriver implements IDoricDriver {
     }
 
     @Override
-    public void connectDevKit(String url, ConnectCallback connectCallback) {
-        wsClient = new WSClient(url, connectCallback);
+    public void connectDevKit(String url) {
+        wsClient = new WSClient(url);
     }
 
     @Override
diff --git a/Android/doric/src/main/java/pub/doric/IDoricDriver.java b/Android/doric/src/main/java/pub/doric/IDoricDriver.java
index 0dc212e2..d503e8f5 100644
--- a/Android/doric/src/main/java/pub/doric/IDoricDriver.java
+++ b/Android/doric/src/main/java/pub/doric/IDoricDriver.java
@@ -16,14 +16,13 @@
 package pub.doric;
 
 
-import pub.doric.async.AsyncResult;
-import pub.doric.dev.ConnectCallback;
-import pub.doric.utils.ThreadMode;
-
 import com.github.pengfeizhou.jscore.JSDecoder;
 
 import java.util.concurrent.Callable;
 
+import pub.doric.async.AsyncResult;
+import pub.doric.utils.ThreadMode;
+
 /**
  * @Description: com.github.penfeizhou.doric
  * @Author: pengfei.zhou
@@ -42,7 +41,7 @@ public interface IDoricDriver {
 
     DoricRegistry getRegistry();
 
-    void connectDevKit(String url, ConnectCallback connectCallback);
+    void connectDevKit(String url);
 
     void disconnectDevKit();
 }
diff --git a/Android/doric/src/main/java/pub/doric/dev/ConnectCallback.java b/Android/doric/src/main/java/pub/doric/dev/ConnectCallback.java
deleted file mode 100644
index 4e65df33..00000000
--- a/Android/doric/src/main/java/pub/doric/dev/ConnectCallback.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package pub.doric.dev;
-
-public interface ConnectCallback {
-    void connected();
-
-    void exception(Exception exception);
-}
diff --git a/Android/doric/src/main/java/pub/doric/dev/ConnectEvent.java b/Android/doric/src/main/java/pub/doric/dev/ConnectEvent.java
deleted file mode 100644
index 520d9699..00000000
--- a/Android/doric/src/main/java/pub/doric/dev/ConnectEvent.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package pub.doric.dev;
-
-public class ConnectEvent {
-}
diff --git a/Android/doric/src/main/java/pub/doric/dev/DevPanel.java b/Android/doric/src/main/java/pub/doric/dev/DevPanel.java
index d8e84e3d..ed831c44 100644
--- a/Android/doric/src/main/java/pub/doric/dev/DevPanel.java
+++ b/Android/doric/src/main/java/pub/doric/dev/DevPanel.java
@@ -21,6 +21,8 @@ import org.greenrobot.eventbus.ThreadMode;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.functions.Consumer;
 import pub.doric.R;
+import pub.doric.dev.event.EOFEvent;
+import pub.doric.dev.event.OpenEvent;
 
 public class DevPanel extends BottomSheetDialogFragment {
 
@@ -62,16 +64,6 @@ public class DevPanel extends BottomSheetDialogFragment {
 
             }
         });
-
-        if (isDevConnected) {
-            getView().findViewById(R.id.connect_dev_kit_text_view).setVisibility(View.GONE);
-            getView().findViewById(R.id.debug_text_view).setVisibility(View.VISIBLE);
-            getView().findViewById(R.id.hot_reload_text_view).setVisibility(View.VISIBLE);
-        } else {
-            getView().findViewById(R.id.connect_dev_kit_text_view).setVisibility(View.VISIBLE);
-            getView().findViewById(R.id.debug_text_view).setVisibility(View.GONE);
-            getView().findViewById(R.id.hot_reload_text_view).setVisibility(View.GONE);
-        }
     }
 
     @Override
@@ -87,7 +79,20 @@ public class DevPanel extends BottomSheetDialogFragment {
     }
 
     @Subscribe(threadMode = ThreadMode.MAIN)
-    public void onMessageEvent(ConnectEvent connectEvent) {
+    public void onOpenEvent(OpenEvent openEvent) {
         isDevConnected = true;
+
+        getView().findViewById(R.id.connect_dev_kit_text_view).setVisibility(View.GONE);
+        getView().findViewById(R.id.debug_text_view).setVisibility(View.VISIBLE);
+        getView().findViewById(R.id.hot_reload_text_view).setVisibility(View.VISIBLE);
+    }
+
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    public void onEOFEvent(EOFEvent eofEvent) {
+        isDevConnected = false;
+
+        getView().findViewById(R.id.connect_dev_kit_text_view).setVisibility(View.VISIBLE);
+        getView().findViewById(R.id.debug_text_view).setVisibility(View.GONE);
+        getView().findViewById(R.id.hot_reload_text_view).setVisibility(View.GONE);
     }
 }
diff --git a/Android/doric/src/main/java/pub/doric/dev/ScanQRCodeActivity.java b/Android/doric/src/main/java/pub/doric/dev/ScanQRCodeActivity.java
index 80a42eb2..0df9e81b 100644
--- a/Android/doric/src/main/java/pub/doric/dev/ScanQRCodeActivity.java
+++ b/Android/doric/src/main/java/pub/doric/dev/ScanQRCodeActivity.java
@@ -6,8 +6,6 @@ import android.widget.Toast;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 
-import org.greenrobot.eventbus.EventBus;
-
 import cn.bingoogolapple.qrcode.core.QRCodeView;
 import cn.bingoogolapple.qrcode.zxing.ZXingView;
 import pub.doric.Doric;
@@ -52,18 +50,8 @@ public class ScanQRCodeActivity extends AppCompatActivity implements QRCodeView.
     public void onScanQRCodeSuccess(String result) {
         setTitle("扫描结果为：" + result);
         Toast.makeText(this, "dev kit connecting to " + result, Toast.LENGTH_LONG).show();
-        Doric.connectDevKit("ws://" + result + ":7777", new ConnectCallback() {
-            @Override
-            public void connected() {
-                EventBus.getDefault().post(new ConnectEvent());
-                finish();
-            }
-
-            @Override
-            public void exception(Exception exception) {
-
-            }
-        });
+        Doric.connectDevKit("ws://" + result + ":7777");
+        finish();
     }
 
     @Override
diff --git a/Android/doric/src/main/java/pub/doric/dev/WSClient.java b/Android/doric/src/main/java/pub/doric/dev/WSClient.java
index d03a0db6..43b9df6d 100644
--- a/Android/doric/src/main/java/pub/doric/dev/WSClient.java
+++ b/Android/doric/src/main/java/pub/doric/dev/WSClient.java
@@ -15,12 +15,11 @@
  */
 package pub.doric.dev;
 
-import pub.doric.DoricContext;
-import pub.doric.DoricContextManager;
-
+import org.greenrobot.eventbus.EventBus;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.io.EOFException;
 import java.util.concurrent.TimeUnit;
 
 import okhttp3.OkHttpClient;
@@ -28,6 +27,10 @@ import okhttp3.Request;
 import okhttp3.Response;
 import okhttp3.WebSocket;
 import okhttp3.WebSocketListener;
+import pub.doric.DoricContext;
+import pub.doric.DoricContextManager;
+import pub.doric.dev.event.EOFEvent;
+import pub.doric.dev.event.OpenEvent;
 
 /**
  * @Description: com.github.penfeizhou.doric.dev
@@ -37,10 +40,7 @@ import okhttp3.WebSocketListener;
 public class WSClient extends WebSocketListener {
     private final WebSocket webSocket;
 
-    private ConnectCallback connectCallback;
-
-    public WSClient(String url, ConnectCallback connectCallback) {
-        this.connectCallback = connectCallback;
+    public WSClient(String url) {
         OkHttpClient okHttpClient = new OkHttpClient
                 .Builder()
                 .readTimeout(10, TimeUnit.SECONDS)
@@ -57,7 +57,7 @@ public class WSClient extends WebSocketListener {
     @Override
     public void onOpen(WebSocket webSocket, Response response) {
         super.onOpen(webSocket, response);
-        connectCallback.connected();
+        EventBus.getDefault().post(new OpenEvent());
     }
 
     @Override
@@ -91,5 +91,9 @@ public class WSClient extends WebSocketListener {
     @Override
     public void onFailure(WebSocket webSocket, Throwable t, Response response) {
         super.onFailure(webSocket, t, response);
+
+        if (t instanceof EOFException) {
+            EventBus.getDefault().post(new EOFEvent());
+        }
     }
 }
diff --git a/Android/doric/src/main/java/pub/doric/dev/event/EOFEvent.java b/Android/doric/src/main/java/pub/doric/dev/event/EOFEvent.java
new file mode 100644
index 00000000..aabb4931
--- /dev/null
+++ b/Android/doric/src/main/java/pub/doric/dev/event/EOFEvent.java
@@ -0,0 +1,4 @@
+package pub.doric.dev.event;
+
+public class EOFEvent {
+}
diff --git a/Android/doric/src/main/java/pub/doric/dev/event/OpenEvent.java b/Android/doric/src/main/java/pub/doric/dev/event/OpenEvent.java
new file mode 100644
index 00000000..b99ccff4
--- /dev/null
+++ b/Android/doric/src/main/java/pub/doric/dev/event/OpenEvent.java
@@ -0,0 +1,4 @@
+package pub.doric.dev.event;
+
+public class OpenEvent {
+}